public async Task <bool> SignUpStudentAsync(string studentId, int courseId)
{
CourseWithStudentServiceModel model = await this.GetCourseWithStudentInfoAsync(studentId, courseId);
if (model == null || model.StartDate < DateTime.UtcNow || model.IsStudentEnrolledInCourse)
{
return(false);
}
StudentCourse studentCourse = new StudentCourse
{
StudentId = studentId,
CourseId = courseId
};
this.database.Add(studentCourse);
await this.database.SaveChangesAsync();
return(true);
}
public async Task <bool> SignOutStudentAsync(string studentId, int courseId)
{
CourseWithStudentServiceModel model = await this.GetCourseWithStudentInfoAsync(studentId, courseId);
if (model == null || model.StartDate < DateTime.UtcNow || !model.IsStudentEnrolledInCourse)
{
return(false);
}
//StudentCourse studentCourse = await this.database
// .Courses
// .Where(c => c.Id == courseId)
// .SelectMany(c => c.Students)
// .Where(s => s.StudentId == studentId)
// .FirstOrDefaultAsync();
StudentCourse studentCourse = await this.database.FindAsync <StudentCourse>(studentId, courseId);
this.database.Remove(studentCourse);
await this.database.SaveChangesAsync();
return(true);
}
